Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet gap den snippets" » "viet giao den snippets", "viet phap den snippets", "viet nam den snippets", "viet cap den snippets", "viet cap dien snippets", "viet giay den snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("viet gap den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet gap den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet gap den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet gap den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.